View source for HP 9121D

{{WikipediaInfoAlt|Device}}
{{DeviceAlerts}}
{{InfoboxDevice
|Picture =Hp-9121d.jpg 
|Release Year = 1982
|Mounting Technology = Through Hole, SMD, BGA, Sockets
|Capacitor Types = Aluminum Electrolytic,  Ceramic
|Leak Risk = Low
|Batteries = None
|Destructive Entry = No
|Storage=3.5in Single Sided Double Density Floppy Disks|Power Connector=IEC C13/C14 Socket}}
HP dual floppy drive with Sony OA-D31V-14 model floppy drives. 

== Known Issues ==

=== Disk not spinning ===
[[File:HP9121-Disk-Motor.png|none|thumb]]

====Causes====
*Magnetic hall sensors failsure
**Test by removing motor assembly, directly powering, and nudge motor to start spinning
====Solutions====
*Replace hall THS103A sensors

===Cracked D10 Diode===
[[File:HP9121-D10-cracked.png|none|thumb]]

====Causes====
*Bent flat when reassembled and crushed by screw post
====Solutions====
*Replace diode

== Disassembly Notes ==
Diode D10 next to one of the screw holes on logic board is very easily pinched when reassembling and may be cracked. Be sure to bend it upright before putting PCB back onto chassis  

== Original Parts ==
=== Main Logic Board ===
''FC-6''
{| class="wikitable sortable"
|+Diodes
!RefDes
!Qty
!Forward Voltage
![https://caps.wiki/wiki/Part_Footprints Mount]
|-
|D10
|1
|3V
|Axial
|}

==Replacement Parts==
===Basic PCB Name===
{| class="wikitable sortable"
|+Capacitors
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|D10
|1
|1N5225B-TAP
|[https://www.mouser.com/ProductDetail/Vishay-Semiconductors/1N5225B-TAP?qs=aho4taYYNuqlbf0sVhG84w%3D%3D Mouser]
|}
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric searc''

== Related Links ==

* More Information: https://wiki.techtangents.net/wiki/HP-9121D_3.5%22_Double_Density_Single_Sided_Floppy_Drive

== References ==
<references />

[[Category:WorkNeeded:General]]
[[Category:WorkNeeded:OriginalParts]]
[[Category:WorkNeeded:ReplacementParts]]